diff --git a/cv4/a_train.c b/cv4/a_train.c
index 3ecfbc8..b890879 100644
--- a/cv4/a_train.c
+++ b/cv4/a_train.c
@@ -1,18 +1,64 @@
 #include "a_train.h"
 #include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
 
-struct car* add_car(struct car* first,const char* target) {
-    return NULL;
+// Додаємо вагон в кінець списку
+struct car* add_car(struct car* first, const char* target) {
+    struct car* newcar = (struct car*)calloc(1, sizeof(struct car));
+    if (newcar == NULL) {
+        return first;
+    }
+    strcpy(newcar->value, target);
+    if (first == NULL) {
+        return newcar;
+    }
+    struct car* this = first;
+    while (this->next != NULL) {
+        this = this->next;
+    }
+    this->next = newcar;
+    return first;
 }
 
+// Виводимо всі вагони (назви станцій)
 void print_train(struct car* first) {
+    struct car* this = first;
+    while (this != NULL) {
+        printf("Station: %s\n", this->value);
+        this = this->next;
+    }
 }
 
+// Видаляємо весь список (звільняємо пам'ять)
 void cancel_train(struct car* first) {
+    struct car* this = first;
+    while (this != NULL) {
+        struct car* next = this->next;
+        free(this);
+        this = next;
+    }
 }
 
-
+// Видаляємо всі вагони з певною станцією
 struct car* clear_train(struct car* first, const char* target) {
-	return NULL;
-}
-
+    struct car* prev = NULL;
+    struct car* this = first;
+    while (this != NULL) {
+        if (strcmp(this->value, target) == 0) {
+            if (prev == NULL) {
+                first = this->next;
+                free(this);
+                this = first;
+            } else {
+                prev->next = this->next;
+                free(this);
+                this = prev->next;
+            }
+        } else {
+            prev = this;
+            this = this->next;
+        }
+    }
+    return first;
+}
\ No newline at end of file